Add models and sdk services example

lib/sdk/models/CategoryModel.dart

@@ -1,6 +0,0 @@
-class Category {
-  int id;
-  String name;
-
-  Category(this.id, this.name);
-}

lib/sdk/models/ProductModel.dart

@@ -1,20 +0,0 @@
-class Product {
-  int id;
-  String name;
-  double price;
-
-  Product(this.id, this.name, this.price);
-
-  static Product fromJson(dynamic json) => Product(
-        json['id'],
-        json['name'],
-        json['price'],
-      );
-}
-
-class ProductRequest {
-  String name;
-  double price;
-
-  ProductRequest(this.name, this.price);
-}

lib/sdk/models/base.dart

@@ -0,0 +1,31 @@
+import 'dart:convert';
+
+abstract class BaseModel<T> {
+  BaseModel();
+
+  Map<String, dynamic> toMap();
+
+  T fromMap(Map<String, dynamic> map);
+
+  T fromJson(String json);
+
+  @override
+  String toString() {
+    return toMap().toString();
+  }
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is BaseModel && other.toMap() == toMap();
+  }
+
+  @override
+  int get hashCode => toMap().hashCode;
+
+  String toJson() => encode(toMap());
+
+  dynamic decode(String json) => jsonDecode(json);
+  String encode(dynamic json) => jsonEncode(json);
+}

lib/sdk/models/category.dart

@@ -0,0 +1,34 @@
+import 'package:sample_sdk/sdk/models/base.dart';
+
+class Category extends BaseModel<Category> {
+  int? id;
+  String? name;
+  Category? parent;
+
+  Category({this.id, this.name, this.parent});
+
+  @override
+  Category fromMap(Map<String, dynamic> map) {
+    id = map['id'];
+    name = map['name'];
+    parent = Category().fromJson(map['parent']);
+
+    return this;
+  }
+
+  @override
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'name': name,
+      'parent': parent?.toMap(),
+    };
+  }
+
+  @override
+  Category fromJson(String json) {
+    return fromMap(decode(json));
+  }
+
+  static Category fromJsonString(dynamic json) => Category().fromJson(json);
+}

lib/sdk/models/product.dart

@@ -0,0 +1,38 @@
+import 'package:sample_sdk/sdk/models/base.dart';
+import 'package:sample_sdk/sdk/models/category.dart';
+
+class Product extends BaseModel<Product> {
+  int? id;
+  String? name;
+  double? price;
+  Category? category;
+
+  Product({this.id, this.name, this.price, this.category});
+
+  @override
+  Product fromMap(Map<String, dynamic> map) {
+    id = map['id'];
+    name = map['name'];
+    price = map['price'];
+    category = Category().fromJson(map['category']);
+
+    return this;
+  }
+
+  @override
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'name': name,
+      'price': price,
+      'category': category?.toMap(),
+    };
+  }
+
+  @override
+  Product fromJson(String json) {
+    return fromMap(decode(json));
+  }
+
+  static Product fromJsonString(String json) => Product().fromJson(json);
+}